Rectifying unit and method of producing the same



April 2,1929. aos-EN I 1,701,234

RECTIFYING UNII' AND METHOD 01|' PRDUCING THE SAIE Filed Jima?. 1927ffy/enfuir l fforney Psa-mea Apr. 2,1929;

UNITEDr STATES.

PATENT OFFICE;

CLARENCE E. OGDEN, OF CINCINNATI, OHIO, ASSIGNOR T0 THE XODEL RADIO COR-PORATION, A CORPORATION 0F OHIO..

RECTIFYING UNIT AND METHOD OF PRODUGING THE SAME. i

Application led June 27, 1927. Serial No. 201,883.

My invention relates to rectifying units, particularly of the copper,oxide type.

ln the construction of rectiers made up of units of the copper oxidetype, in order to 5 provide a rectifier of comparatively high capacityit is necessary that the rectifying units be of considerable area, andby reason' of this l have found that during the necessary heattreatment' for the production of the units, the

in plates are extremely apt to warp and lose their flat shape so that itbecomes difiicult properly to assemble the units for-the construction ofthe rectifier, and the resultant assembly lacks neat and symmetricalappearance which is le maintained when the units are not thus deformed.

The present invention therefore has for its principal object theconstruction of rectifying units in which the liability to such warp- 2@ing and deforming is overcome.

In the drawings: Figure 1 indicates a rectifying unit constructed inaccordance with this invention.

Figure 2 is a section ofl a unit constructed 25 in accordance with thisinvention.

Figure 3 is an elevation of an assembly of ,30 heat treatment andcooling is provided with layers of oxide 2. For the formation of thisoxide the.J plate 1 must be placed in an electric or other furnace andthe temperature raised to approximately 1900 degrees Fahrenheit, durinwhich process the plate bein of considera le area is apt, and in factamost invariably does, warp and become misshapen. This warping isobviated by means of ribs 3 which are formed in the metal by means ofsuitable dies at the time that the plates are stamped. The ,ribs 3 areso irregularly disposed in' the plate that a rib or ribs are presentedat an angle to the line of any possible warping bend in the plate itselfduring heat treatment, and such ribs therefore stien the late andprevent the deformation.' The plate 1s provided with a perforation 4 bymeans of which it is assembled or stacked with others upon a bolt 5 inthe usual manner.

Having thus fully described my invention, what I claim as new andvdesire to secure by Letters Patent is: i

1. The method of producing a rectifying unit, comprising the forming of'a metal plate with ribs irregularly disposed in its surface, then heattreating said plate to forman oxide thereon. A

2. As an article of manufacture, a rectifying unit, comprising a platehaving a layer of Y oxide, and a plurality of ribs formed in andirregularly disposed on said plate so as to re-` inforce the sameagainst warping.

CLARENCE E. oGDEN.

